Cummins 4BT 6BT diesel engine motor 3960317 oil cooler gasket, with Cummins engine oil cooler gasket list as:manufactured by Cummins China, who produces many Cummins engine series, including:

SN    Models
1    4BT3.9, 6BT5.9, 4ISBE4.5, 6ISBE6.7, QSB4.5, QSB6.7
2    6CT8.3, 6LT8.9, ISLe8.9, QSL
3    MTA11, QSM, ISME
4    ISF2.8, ISF3.8
5    ISZ13, ISG
6    NT855
7    KT19, KT38, KT50, etc

for different applications, such as:

SN    Applications
1    diesel generator set
2    water pump set, fire pump set
3    construction and engineering machinery (crane, excavator, bulldozer, loader, etc)
4    Automobile (bus, coach, shuttle, etc)
5    marine main propulsion, marine auxiliary generator set

And besides complete engines, we also export a lot of engine parts parts, including:    

SN    Part Descriptions
1    cylinder head, cylinder block, cylinder liner
2    piston, piston ring, conrod
3    main bearing, conrod bearing, thrust bearing
4    fuel injector, fuel injection pump, common rail
5    oil pan gasket, cylinder head gasket
6    overhaul gasket kit, upper gasket kit, lower gasket kit
7    oil pan
8    fuel transfer pump, water pump, oil pump, vacuum pump, power steering pump
9    oil filter, fuel filter, fuel water separator, air filter, Etc

Beyond Cummins, also engines, gearboxes, and auto body parts for some other brands are available, such as:

SN    Brands
1    Deutz, MWM
2    CAT
3    Detroit
4    Isuzu
5    Komatsu
6    Perkins
7    Weichai
8    Yuchai
9    SDEC
10    Advance
11    Fada
12    Jinbei, Brilliance
13    Iveco, Yuejin
14    etc